Quality control and Connector Field welding process and method
The construction technology in China has developed rapidly. The technology of installing copper waterstops in buildings has been very common and widely used, mainly because of the underground of buildings be launched At the same time, in order to speed up the construction progress and backfill the foundation pit as soon as possible after the completion of the roof construction of the basement, advanced water stop measures have been taken for the copper waterstop of the basement floor and the outer wall.
On site welding technology and method of water stop joint
A、 Welding wire and gas welding flux: red copper water stop base metal shear strip is used, deoxidizer is placed in welding powder, and gas flux 301 is used for welding powder
B、 Gas welding process: clean the welding wire and weldment before welding, generally with wire brush; or Sandpaper Remove oil stain and adsorbed gas on the surface.
C、 Neutral flame is selected for welding flame: the oxidation flame will oxidize the molten pool and form brittle cuprous oxide in the weld; the carbonization flame will produce carbon monoxide and hydrogen, which will enter the weld and form pores.
D、 Preheat the weldment before welding: the preheating temperature is 400 500C.
E、 As the high-temperature copper liquid is easy to absorb gas, it is a porous defect of weld metal. At the same time, the coarse grains in the weld heat affected zone will also cause welded joint The mechanical properties of the weld are reduced, so the welding layer of the weld: the less the better, and the single pass welding is adopted during welding. After welding, hammer the welded joint to refine the metal grain, thus improving its mechanical properties.
Quality control of copper waterstop
(1) The positioning device of copper waterstop strip must be inspected and approved by the Supervisor before concrete pouring.
(2) The welding quality of copper strip water stop joint must be inspected. If the Supervisor thinks it necessary, oil leakage inspection must be carried out, and the oil stain shall be cleaned after it is qualified.
(3) The formwork shall be erected firmly, and the formwork on both sides of the waterstop shall be supported in "Q" shape or other supporting structures to avoid dislocation and slurry leakage due to formwork deformation.
(4) The whole special formwork shall be used at the copper waterstop to ensure that the waterstop is firmly positioned and there is no leakage at the joints.
(5) During the pouring process, large aggregates shall be prevented from gathering at the waterstop (strip), and carefully vibrated to ensure that the concrete at the joint of waterstop (strip) is dense.
(6) Reasonably arrange the pouring and vibrating procedures, and pay attention to avoid concentrated bleeding at the waterstop (strip).
(7) In the process of concrete pouring, the Contractor shall arrange special personnel to patrol and manage. The Supervisor shall strengthen the inspection of the waterstop, and instruct the Contractor to correct in time if deviation is found.
(8) Attention shall be paid to the backfilling of the concrete under the copper waterstop (strip), and the oblique insertion shall be reasonably adopted
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